Method for generating a human likeness score

ABSTRACT

One embodiment of the invention is a method utilizing a CAPTCHA to generate a human likeness score including blocks: a) receiving a user solution to the CAPTCHA; b) receiving a user interaction pattern descriptive of an interaction undertaken by the user, through a graphical interface of the CAPTCHA, to achieve the user solution; c) determining the accuracy of the user solution; d) comparing the user interaction pattern against an interaction model generated from interaction patterns of previous users; e) calculating the human likeness score based upon the determination of block c) and the comparison of block d), wherein the human likeness score lies within a continuum of human likeness scores.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 61/467,124, filed 24 Mar. 2011, which is incorporated in its entirety by this reference.

TECHNICAL FIELD

This invention relates generally to the human verification field, and more specifically to a new and useful method for generating a human likeness score in the human verification field.

BACKGROUND

Many websites and applications apply various techniques and methods to discern a human user from automated software prior to granting certain access or privileges to the user. Distinction between a human user and automated software is often desired, such as when a user is signing up for a service, when a user is attempting to log in to a service or account, when a user is participating in an online poll or forum, or when a user generating an online post. Many websites employ CAPTCHAs (Completely Automated Public Turing tests to tell Computers and Humans Apart) to achieve such functionality. A common CAPTCHA includes a depiction of distorted text images and requires transcription of the distorted text image. However, websites, applications, and other services that implement such CAPTCHAs risk inadvertently driving away traffic by legitimate users (i.e. non-spamming humans) while providing only minimal protection against automated software and human spammers. Alternatively, websites, applications, and other services that fail to implement some such security feature risk security breaches.

Therefore, there is a need in the human verification field to create a new and useful method for generating a human likeness score indicative of the legitimacy of a use. This invention provides such a new and useful method.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a flowchart representation of a method of the preferred embodiment of the invention;

FIG. 2 is a schematic representation of the elements of a CAPTCHA of the preferred embodiment;

FIGS. 3A-3H are schematic representations of exemplary game-like CAPTCHAS of the preferred embodiment;

FIG. 4 is a schematic representation of a system implementation of the preferred embodiment;

FIGS. 5A, 5B, and 5C are schematic representations of a CAPTCHA of the preferred embodiment at various time intervals;

FIGS. 6A, 6B, and 6C are schematic representations of a CAPTCHA of the preferred embodiment at various time intervals;

FIGS. 7A, 7B, 7C, and 7D are schematic representations of a CAPTCHA of the preferred embodiment at various time intervals;

FIGS. 8A and 8B depicts a decision tree for completing a block of the preferred embodiment;

FIGS. 9A-9E depict a user input path, an average user input path, the noise in the user input path, noise in a typical human input path, and noise in a typical automated software input for a block of the preferred embodiment; and

FIGS. 10A-10C depict a user input path geometry, a typical human input path geometry, and a typical automated software input geometry for a block of the preferred embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following description of the preferred embodiments of the invention is not intended to limit the invention to these preferred embodiments, but rather to enable any person skilled in the art to make and use this invention.

As shown in FIG. 1, the method S100 utilizing a CAPTCHA to generate human likeness score, the CAPTCHA provided through a graphical interface, includes the blocks of: receiving a user solution to the CAPTCHA S110; receiving a user interaction pattern descriptive of an interaction undertaken by the user, through the graphical interface, to achieve the user solution S120; determining the accuracy of the user solution S140; comparing the user interaction pattern against an interaction model generated from interaction patterns of previous users S140; and calculating the human likeness score based upon the determination of block S130 and the comparison of block S150, wherein the human likeness score lies within a continuum of human likeness scores S160. The method S100 may further include the blocks of: comparing the human likeness score to a threshold likeness score to verify that the user is human S170 and/or adding the user solution to a catalog of user preferences S180. The method S100 may also include the blocks of: receiving a request for a CAPTCHA; and fulfilling the request for the CAPTCHA by generating certain details of the CAPTCHA and/or the complete CAPTCHA S190.

As shown in FIG. 1, the method S100 may also be a method utilizing a CAPTCHA to verify that a user is human, the CAPTCHA provided through a graphical interface, including the blocks of: receiving a user solution to the CAPTCHA S110; receiving a user interaction pattern descriptive of an interaction undertaken by the user, through the graphical interface, to achieve the user solution S120; receiving user data that is distinct from the CAPTCHA and the user interaction pattern S130; determining the accuracy of the user solution S140; comparing the user interaction pattern against an interaction model generated from interaction patterns of previous users S150; analyzing the user data for automated software (or human spammer) indicators S155; calculating a human likeness score based upon the determination of Block S140, the comparison of Block 150, and the analysis of Block S155, wherein the human likeness score lies within a continuum of human likeness scores S160; and comparing the human likeness score to a threshold likeness score to verify that the user is human S170.

The method S100 is preferably performed by a server in communication with a publisher configured to present the CAPTCHA to the user via a host website or application. The publisher may present the CAPTCHA to the user via: a website; a mobile application; a web- or application-based forum; an online, desktop, or application-based email client; an online gaming site or service (e.g., Xbox live); or any other suitable site, service, or application configured to provide data to the user and to receive an input from the user. The site, service, or application through which the CAPTCHA is presented to the user preferably executes on a digital device incorporating a digital display, such as an automotive console, a desktop computer, a laptop computer, a tablet computer, a television, a radio, a desk phone, a mobile phone, a smartphone (e.g., an iPhone), a PDA, a personal navigation device, a personal media player (e.g., MP3 player, iPod), a camera, a gaming console or controller, a remote control, a watch, or a heads-up display (HUD). The publisher and/or server preferably communicate(s) with the digital device via a communication channel, such as Wi-Fi, LAN, 3G cellular, 4G cellular, Ethernet, or other cellular or internet connection, or via any other analog or digital communication channel. The transfer of data, including details of the CAPTCHA, user data, the user solution, the user interaction, and the human likeness score, between relevant parties is depicted in FIG. 4.

In one variation, the server generates the CAPTCHA, including the content in and instructions of the CAPTCHA, and sends the CAPTCHA to the publisher, wherein the publisher then presents the CAPTCHA to the user. In a second variation, the server generates the CAPTCHA, including the content in and instructions of the CAPTCHA, and directly presents the CAPTCHA to the user (e.g., through a host website or application) following a request therefor from the publisher. In a third variation, following a request for a CAPTCHA from the publisher, the server specifies specific details of the CAPTCHA (i.e. less than the entirety of the CAPTCHA) and sends the details to the publisher, wherein the publisher then assembles the CAPTCHA, based upon the details, and presents the CAPTCHA to the user. In a fourth variation, the CAPTCHA is generated, at least in part, by the publisher (e.g., by selecting a CAPTCHA format from the set of generic CAPTCHA formats shown in FIGS. 3A-3H and assigning details to the CAPTCHA); in this variation, the server may solely function to analyze the user solution and the user interaction to generate the human likeness score (i.e. Blocks S110-S160). However, the server and/or the publisher may function together or separately to create the CAPTCHA and present the CAPTCHA to the user.

The method S100 of the preferred embodiment utilizes a CAPTCHA, a “Completely Automated Public Turing test to tell Computers and Humans Apart,” to generate the human likeness score S160 and/or to verify that the user is human S170. The CAPTCHA is preferably presented to the user prior to granting additional access or information to the user, prior to completing a transaction, prior to generating a user account, and/or for any other reason necessitating verification that the user is human (or not automated software or a human spammer).

As shown in FIG. 2, the CAPTCHA preferably includes a graphical interface 193; the graphical interface 193 may be, effectively, a “box” presented to the user on the digital display of a digital device of the user, wherein information, symbols, and/or other objects relevant to the CAPTCHA are presented therein and the user employs the information, symbols, and/or other objects to complete the CAPTCHA. However, the graphical interface 193 may be of any other form defining any other input area. The graphical interface 193 may be depicted within a web browser or application directly, or may be presented within a pop-up window or separate application, though the graphical interface 193 may be presented to the user in any other way.

As shown in FIG. 2, an object 194 is preferably depicted within the graphical interface 193 of the CAPTCHA. At least one characteristic or trait of the object is preferably haphazard, randomly generated, pseudorandomly generated, or otherwise seemingly irregular in selection or assignment. (Because the server fulfilling the method S100 may incorporate software incapable of generating a truly random number or truly random instance, the characteristic of the object 194 may be pseudorandomly generated, such as by accessing a clock instance, by stepping through the digits of pi, or by any other method of pseudorandomly generating a number or other instance; the publisher may also fulfill the role of specifying details of the CAPTCHA, including the characteristic of the object 194.) The characteristic of the object 194 may be any of: the initial location, the initial orientation, the initial speed, the initial direction of motion, the (initial) color, the (initial) size, the (initial) orientation, the (initial) shape, and the (initial) context of the object 194. Preferably, the irregular assignment of the characteristic of the object 194 differentiates the CAPTCHA from a previous CAPTCHA presented to the user or any other user. This preferably yields the benefit of generating a substantially unique CAPTCHA that automated software (e.g., a bot, an automated script, automated software), posing as a human, cannot solve by simply capturing an instance of the CAPTCHA and accessing the CAPTCHA solution by finding the captured instance in a database of CAPTCHA instances and associated CAPTCHA solutions. Specifically, CAPTCHAs thus generated may be substantially unique, wherein (almost) every such CAPTCHA requires a unique solution to complete; this may force an automated script, posing as a human, to understand the CAPTCHA and fully comprehend the CAPTCHA, which is far more difficult to achieve than practices currently implemented in the field of automated CAPTCHA solvers; such CAPTCHAS, therefore, may be more secure and accurate in isolating humans from automated software.

As shown in FIG. 2, the object 194 depicted within the graphical interface 193 preferably moves therein following initiation of the CAPTCHA, and the user is preferably required to manipulate or interact with the object 194 to compete the CAPTCHA. As shown in FIGS. 5A and 6A, two different CAPTCHAs, including the same object 194 and additional object 195 within the same graphical interface 193 and the same prompt 191, may require substantially different user interactions to complete the CAPTCHA despite the initial (T 0:00) similarities between the two CAPTCHAs. Therefore, the step of pseudorandomly assigning a characteristic to the object 193 of the CAPTCHA may have the benefit of increasing the difficulty for automated software to solve the CAPTCHA.

Other elements of the CAPTCHA may also be haphazard, randomly generated, pseudorandomly generated, or otherwise seemingly irregular. Such other elements may be the prompt 191 (e.g., task, instruction, or challenge) of the CAPTCHA, the type of CAPTCHA (e.g., the game format), the shape of the graphical interface 193, the type of user interaction or input, or any other aspect of the CAPTCHA. In a first example, the CAPTCHA of FIG. 3F, including the graphical interface depicting four white circles, three hashed stars, an “A” bin, and a “B” bin may be pseudorandomly assigned any of the following prompt 191: (1) drag the white circles into the “A” bin; (2) drag the white circles into the “B” bin; (3) drag the hashed stars into the “A” bin; (4) drag the hashed stars into the “B” bin; (5) drag one hashed star and one white circle into the “A” bin; (6) drag one hashed star and one white circle into the “B” bin; (7) drag two hashed stars and one white circle into the “A” bin; (8) drag one hashed star and two white circles into the “B” bin; (8) drag one hashed star into the “A” bin and one white circle into the “A” bin; etc. Furthermore, additional objects 195 (e.g., bins, circles, squares, stars, triangles, etc.) and/or colors may significantly increase the number of potential prompts associated with the CAPTCHA. In a second example, the CAPTCHA may be randomly selected from a set of generic CAPTCHA formats, such as from any of the formats depicted in FIGS. 3A-3H, including Draw, Complete (Fill In), Build, Knock Down (Topple), Score, Drag, and Survey, or other formats including Move, Paint, Hammer, Shoot, Navigate, Destroy, Select, and Drop. In a third example, the requisite user input shifts between any of a cursor movement, a mouse click, a keystroke, a voice command, a touch, a facial expression, a gesture, or any other relevant user input or combination of user inputs.

The various aspects, elements, and characteristics of the CAPTCHA may provide a plethora of variables by which a substantially unique CAPTCHA may be generated for the user, wherein the CAPTCHA is still substantially easy for a human to complete but substantially difficult for automated software to complete, such as with current methods of automated CAPTCHA solvers.

The CAPTCHA is preferably an object-based problem and provides a visual challenge to the user that requires user interaction with the object 194. The object-based problem preferably includes a prompt 191 (shown in FIG. 2) that instructs the user how to complete the CAPTCHA; the prompt 191 may be text-based, but may also be audio- or graphic-based or provided via any other suitable media. In some cases, the prompt 191 may rely upon well-understood principles, and in some variations may be inherent in mechanics of the game, challenge, or survey defining the CAPTCHA. For example, the prompt 191 may instruct the user to navigate a maze while collecting prizes and avoiding enemies therein (shown in FIG. 3E). This example may incorporate a wide variety of images of objects that a human would interpret as prizes (e.g., images of coins, ice cream, toys) and as enemies (e.g., monsters, aliens); such contextual analysis may be extremely difficult for automated bots to complete. In an example of the CAPTCHA that is a survey, exemplified in FIG. 3H, the prompt 191 may ask the user to select a preferred Chevrolet Camaro from a list of Camaros, including a bittersweet red Camaro, a cherry red Camaro, a burgundy Camaro, a fire engine red Camaro, a rose Camaro, and a rusty Camaro; in this example, any selection of the rusty Camaro may be deemed an incorrect answer, and any other selection may be added to a database of user preferences or survey results. However, the prompt 191 may be of any other suitable type or form.

The user preferably provides a user input, through the graphical interface 193, to achieve the user solution to the CAPTCHA (the user input is preferably tracked within the graphical interface 193). The user input is preferably one of a mouse interaction, a touch interaction, a joystick interaction, an arrow interaction, a gesture, a facial expression, a voice command, and/or any other suitable non-text-based form of navigation. Such forms of interaction are preferably multidimensional in that they require a user interaction beyond discrete inputs (e.g., transcribing text, single keystrokes). For example, a mouse or cursor input may provide a directional input along two axes, a mouse state, and timing input (e.g., cursor speed), whereas keystrokes provide only the state of a key and the timing of the keystroke. The multidimensional aspect of the user input is preferably captured in Block 120 and analyzed in Block 150 to provide human and/or automated software indicators distinct from the user solution. The indicators preferably provide a second analytic by which to verify that the user is human. In a first example, the multidimensional aspect includes a cursor path completed by the user in the process of fulfilling the CAPTCHA; if the path is substantially geometric (e.g., comprises straight and arcuate lines) the indicators suggest that the user is inhuman because a typical human is unlikely to complete such geometric input motions. In a first variation of this first example, if the input path is substantially without noise, or the noise is substantially greater than or less than input noise typical of a human user, then the indicators suggest that the user is inhuman; this variation and others may require Fourier analysis of the input path and/or any other relevant mathematical manipulation thereof to isolate a characteristic of the user input. In a second variation of the first example, if the input path includes substantially geometric input changes, such as from a linear path to an arcuate path or from a substantially horizontal direction to a substantially vertical direction without typical lag, inaccuracy, or noise, the indicators suggest that the user is inhuman. In a second example, the multidimensional aspect includes a timing element of the user input, wherein the indicators suggest that the user is inhuman if the input velocity is substantially faster or slower than the input velocity of a typical human. In a first variation of the second example, if the user begins the task too soon after (or too long after) initiation of the CAPTCHA, the indicators suggest that the user is inhuman. In a second variation of the second example in which the CAPTCHA includes the object 194 that is moving, the indicators suggest that the user is inhuman if the cursor input does not lag the motion of the object 194 within a range that is typical of a human user. However, the multidimensional aspect of the user input (user interaction) may be of any other type and may be used in any other way to determine human and/or automated software indicators.

The object 194 is preferably a graphical representation depicted within the user graphical interface 193 but may be any suitable representation of an element or tangible object 194; a plurality of objects may also be depicted within the graphical interface 193. In one example, the object 194 is a colored shape such as a blue circle or a yellow triangle. In another example, the object 194 includes a real-life image such as an image of an ocean or of a boat. The object 194 is preferably crucial to solving the CAPTCHA, though the object 194 or any additional object(s) 195 may be excessive and unnecessary to completing the CAPTCHA, thus serving to distract the user. As mentioned above, the object(s) may leverage contextual or inherent properties of the associated image to communicate to a human a particular or inherent meaning; automated software may lack such contextual understanding, which may result in a CAPTCHA that is substantially easy for a human to solve but difficult for automated software to complete.

As mentioned above, an option to change to an accessible version of the object-based CAPTCHA may provide an alternative version thereof for blind or disabled users. This alternative challenge preferably includes an audio prompts to create an interactive audio-based CAPTCHA, but the challenge may also implement vibratory or tactile feedback or any other mechanism to present the CAPTCHA (and the challenge thereof) to the user.

The CAPTCHA prompt 191 may further be a dynamic prompt, the correct solution(s) to the CATPCHA changing with the prompt 191. For any given configuration of the challenge area 192 (e.g., a characteristic or setting of the objects 194, 195) a plurality of generic prompts may be available for selection prior to initiation of the CAPTCHA. For example, in the challenge area 192 of FIG. 2, the following generic prompt types may be available: “Build a rectilinear bridge across Box A and Box B;” “Stack two squares and a star on Box C;” and “Drag four white circles into the C bin.” Also or alternatively, a plurality of CAPTCHA template prompts, each with at least one variable, may be available for a given generic CAPTCHA format. For example, a template prompt includes “Drag N C1 O into the C2 bin,” wherein N: number, C1: color of the object, O: object, and C2: color of the bin. In this variation, the type of object to drag (e.g., circle, square, star, octagon, etc.), the number of those objects to drag, and/or the destination of the object(s) (e.g., where to drag an object) may define the variables of the prompt 191. Each prompt 191 may have an associated type of challenge area(s), though the prompt 191 may be included in any other number of prompt templates and the prompt 191 may include any other number of variables. The dynamic prompt 191 preferably functions to introduce significant variability in the objective of the CAPTCHA.

The graphical interface 193 of the CAPTCHA may also include additional dynamic objects 195 (or other elements) within the challenge area 192; these additional dynamic objects 195 preferably provide additional variability amongst such CAPTCHAs and thus increase the number of possible unique CAPTCHAs with unique solutions. Preferably, the additional dynamic objects 195 also move within the challenge area 192; motion of the additional dynamic objects 195, with the object 194, may encourage more complex user interactions within the graphical interface 193. In one variation, a physics engine controls interactions between the object 194, the additional dynamic objects 195, the challenge area 192 (e.g., the perimeter of the graphical interface 193), and/or the user (e.g., a cursor); the physics engine may therefore function to require the user to understand complex inter-object interactions. Furthermore, may change over time within the CAPTCHA: the representation of the object 194 and the additional dynamic objects 195; the number of instances of a type, shape, color, context, speed, and/or direction of motion of the object 194 and/or additional dynamic object 195; a game play mechanic; an interaction parameters such as friction or gravity; or any other suitable aspect or characteristic of the CAPTCHA.

The challenge area 192 depicted within the graphical interface 193 may also be dynamic, wherein the challenge varies in size, shape, orientation, and/or position within the graphical interface 193 from one CAPTCHA to the next, thus functioning to further increase variability amongst such CAPTCHAs.

The object 194, additional dynamic objects 195, other objects or elements depicted within the graphical interface 193, the challenge area 192, and/or any other aspect, characteristic, or elements of the CAPTCHA may also be themed. A theme for the CAPTCHA may provide context for the CAPTCHA and/or imply the prompt 191 for the CAPTCHA. The theme may also provide an avenue for the publisher of the CAPTCHA, an external advertiser, or any other third party to customize the CAPTCHA to deliver an advertisement or other message to the user. Such third-party theming (or branding) of the CAPTCHA may provide a vehicle by which CAPTCHAs may be customized, thus increasing the diversity and uniqueness of CAPTCHAs, while furnishing an engaging medium for users to view advertisements. Because the user may be actively engaged in completing the CAPTCHA that includes an advertisement, the advertisement within the CAPTCHA may have a greater impact on the user than current web- and mobile application-based advertising strategies. A software development kit (SDK) for the CAPTCHA and related service are preferably provided to the publisher, external advertiser, or other third party for use in: adding assets (e.g., marketing material) to existing CAPTCHAs; adding assets to generic CAPTCHA formats; customizing CAPTCHAs; creating unique CAPTCHAs and/or generic CAPTCHA formats; modifying and/or defining correct solutions to CAPTCHAs; adjusting the threshold likeness score; or for any other suitable purpose. CAPTCHAs and/or changes to existing CAPTCHAs may be automatically tested and/or integrated within the server configured to provide the CAPTCHA. The SDK is preferably provided via a dashboard accessible by the publisher (or representative thereof) or via a web-based application or program, though the SDK may be provided in any other form.

Block S110 of the preferred embodiment, including receiving the user solution to the CAPTCHA, functions to capture the result of the CAPTCHA, provided by the user, for subsequent comparison to a correct solution of the CAPTCHA. Block S160, including calculating the human likeness score, preferably accounts for the user solution to the CAPTCHA, since analysis of the user interaction pattern alone may not adequately inform the human likeness score. The CAPTCHA is preferably substantially easy for a human user to complete and substantially difficult for automated software to complete, preferably due to the context of objects depicted within the CAPTCHA, variability within the CAPTCHA, object-specific prompts, and/or other characteristics of the CAPTCHA described above. The user solution, when compared to a correct solution for the CAPTCHA in Block S140, may therefore present a significant indication of the humanness of the user. The user solution is preferably captured by the publisher presenting the CAPTCHA and then transmitted to the server for subsequent analysis and manipulation in Blocks S140 and S160, as shown in FIG. 4. However, the user solution may be captured by any other associated entity, such as the website or application hosting the CAPTCHA or directly by the server; the user solution may also be transmitted to any relevant entity for such analysis and manipulation.

The user solution preferably includes the state of the CAPTCHA upon completion thereof by the user. Cessation of the CAPTCHA may be automatic, wherein the CAPTCHA ceases following a solution provided by the user or expiration of specified game time; alternatively, cessation of the CAPTCHA may be manual, wherein the CAPTCHA ceases only following a specific input by the user, such as a user selection of a “Submit” button or a “Finished” button. The user solution is also preferably distinct from the user interaction or user interaction pattern. Specifically, the user interaction is preferably any portion of a user interaction within the CAPTCHA, graphical interface, or challenge area prior to completion of the CAPTCHA. The user solution is preferably the state of the CAPTCHA upon completion thereof, but may also include additional states or instances of the CAPTCHA prior to completion thereof. In a first example shown in FIGS. 5A, 5B, and 5C, the prompt of the CAPTCHA is “Drag four white circles into the bin with the orange C;” at twelve seconds (T 0:12), the user drags a first white circle into the orange bin; at fourteen and eighteen seconds (T 0:14, T 0:18), the user drags a second and third white circle into the orange bin; and at twenty-one seconds, the user drags a fourth white circle into the orange bin. In this first example, the user solution is preferably four white circles dragged into the orange bin, despite the fact that the white circles were dragged into the orange bin at separate times. In a second example shown in FIGS. 7A, 7B, 7C, and 7D, the prompt of the CAPTCHA is “Build a tower with the white squares and knock it down with the white circle;” the user builds a tower with the white squares by nineteen second (T 0:19); and the user drags the white circle over the tower to knock the tower down at twenty-three and twenty-seven seconds (T 0:23, T 0:27). In this second example, the user solution preferably includes an instance of the constructed tower and at least two instances of the circle knocking down the tower. In a third example implementing a Pac-Man-like game, as shown in FIG. 3E, the user solution preferably includes: the final score achieved by the user; each instance in which the user captures a dot or power pellet; and each instance in which a ghost meets the user. However, the user solution may be of any other type and include any other information relevant to the CAPTCHA.

Block S110 of the preferred embodiment, including receiving the user interaction pattern descriptive of an interaction undertaken by the user, through the graphical interface, to achieve the user solution, functions to capture an input of the user for subsequent comparison against interactions of other users indicative of human and/or automated software characteristics of the user. Block S160, including calculating the human likeness score, preferably accounts for the user interaction pattern, since analysis of the user solution alone may not adequately inform the human likeness score. The CAPTCHA preferably requires a user interaction that is distinct from the user solution, such as a cursor movement, a mouse click, a keystroke, a voice command, a touch, a facial expression, a gesture, or any other relevant user input that is not an instance specific to a solution of the CAPTCHA. For example, a purely text-based CAPTCHA that requires the user to type in the words depicted in a distorted image, wherein the user interaction is solely keystroke-based, may not provide a vehicle by which to capture the user interaction (although, in some variations, the timing of a user keystroke may define the user interaction of the CAPTCHA of the preferred embodiment). However, a CAPTCHA requiring a cursor or touch input (or other multidimensional input), such as the CAPTCHA shown in FIGS. 3A-3H, may provide an appropriate vehicle by which to capture the user interaction. In a first example, the user interaction is a portion of the cursor path shown in FIG. 1. In a second example, an image of something typically considered funny is first presented, within the graphical interface of the CAPTCHA, to the user; an image of something that is sad is subsequently presented; the user interaction is a facial expression of the user (e.g., captured by a camera incorporated into the digital device), wherein a user solution in line with a correct solution includes a first facial expression that is a smile and a second facial expression that is a frown or wince substantially soon after the first and the second images are released to the user. However, the user interaction may be of any other form and captured in any other way.

The user interaction is preferably captured within the graphical interface of the CAPTCHA, such as in the variation in which the user interaction is a touch or cursor motion within the graphical interface and provided via a mouse, touchpad, touch screen, trackpad, joystick, game controller, or other user input device. In this variation, the user interaction may be captured by the publisher presenting the CAPTCHA, by the website or application hosting the CAPTCHA, the server generating the CAPTCHA and/or calculating the human likeness score, or any other associated entity. Alternatively, a peripheral device in communication with the digital device, such as a camera (integral with or plugged into the digital device), a digital wristband (e.g., the Jawbone UP), a cell phone with an integral accelerometer or gyroscope, a gaming console, or any other suitable peripheral device, may be accessed by the publisher, website, application, server, and/or other associated entity to track and capture the user interaction.

The user interaction is preferably captured by the publisher presenting the CAPTCHA and then transmitted to the server for subsequent analysis and manipulation in Blocks S150 and S160, as shown in FIG. 4. However, the user interaction may be captured by any other associated entity, such as the website or application hosting the CAPTCHA or directly by the server; the user interaction may also be transmitted to any relevant entity for such analysis and manipulation.

The method S100 may further comprise the block of receiving user data that is distinct from the CAPTCHA S130. Block S160, including calculating the human likeness score, preferably accounts for the user solution and the user interaction pattern in calculating the human likeness score; however, Block S160 may also incorporate user data to further inform the human likeness score. In a first variation in which the user data includes a CAPTCHA (or indication thereof) previously presented to the user, the data may indicate how many CAPTCHAs the user has attempted in a given period of time. In a first example, more that 100 attempted CAPTCHAs within a twenty-four-hour period indicates that the user is automated software as this is uncharacteristic of a typical human user. In a second example, a previous CAPTCHA that was failed by the user suggests that the user may be inhuman, and the subsequent CAPTCHA selected for the user is substantially more difficult for automated software to complete that the prior CAPTCHA. In a second variation, the user data includes an Internet Protocol (IP) address of the user. In a first example of the second variation, if the user IP address is associated with a location in which humans are historically paid for solving CAPTCHAs (e.g., India and China), the user data is used to select a more difficult CAPTCHA or to reduce the human likeness score of the user, as shown in FIGS. 8A and 8B. (In this example, the human likeness score may be considered ‘an appropriate user score’ rather than a human likeness score since, although a paid human solver is still human, such paid human solvers (e.g., human spammers) may not be considered appropriate users and a service employing such CAPTCHAs may desire to restrict access to such paid human solvers.) In a third variation, the user data is a cookie associated with the user. In a first example of the third variation, as shown in FIG. 1, a plurality of user cookies are used to determine if the user has accessed a website in a manner typical of a human, such as by searching for and accessing the website through Google. In a second example, timestamps may be gleaned from user cookies to determine if usage is characteristic of a human (e.g., the user sleeps and is not at a computer for more than twenty-four hours at a time). In a third example, user cookies indicate that the user visits other websites that do not require user completion of CAPTCHAs, which suggests that the user is not automated software. The user IP address and/or user cookie may also be used to link the user to past CAPTCHA attempts, to link the user to a previous human likeness score, and/or to ascertain whether the user was previously determined to be human. In a fourth variation, a social networking account (e.g., Facebook account) of the user may be accessed and data siphoned therefrom. In a first example, the age and friends of the user are compared to a list of favorite music and books of the user to determine if the interests of the user match the age or demographic of the user, wherein a mismatch suggests that the user is an automated script (and that the social network account is falsified). In a second example, the demographic of the user is siphoned from the account of the user to determine a demographic of the user, such as age, race, gender, nationality, education level, existing disabilities or handicaps, field of employment, etc., which may be subsequently used in Block S150 in the comparison of the user interaction pattern to interaction patterns of previous users. However, any other user data may be collected and used in any other way.

The publisher, the host website or application, or the server may capture the user data and the user data may be transmitted between any relevant parties for subsequent analysis in Block S155.

Block S140 of the preferred embodiment, including determining the accuracy of the user solution, functions to determine if the user solution is correct and/or falls within a range of acceptable (e.g., correct) solutions to the CAPTCHA. As mentioned in a preceding section, Block S160, including calculating the human likeness score, preferably accounts for the user solution to the CAPTCHA, since analysis of the user interaction pattern alone may not adequately inform the human likeness score. Because the CAPTCHA is preferably substantially easy for a human to complete and substantially difficult for automated software to complete, the accuracy of the user solution is preferably ascertained in Block S140. In a first variation in which the CAPTCHA has a single correct solution, the user solution may be compared thereto. For example, for a CAPTCHA with the prompt “Click ‘Finished’ after dragging one black circle into the yellow bin,” the user solution is determined to be correct only if the user drags a single black circle into the black bin prior to clicking “Finished,” and the user solution is determined to be incorrect if the user drags two black circles into the yellow bin or drags one yellow circle into the black bin. In a second variation in which the CAPTCHA has a range of correct solutions, Block S140 preferably determines if the user solution falls within the bounds of correct solutions. In a first example of a CAPTCHA with the prompt “Drag two black circles into the yellow bin,” the user solution is determined to be correct regardless of which black circle is dragged into the yellow bin first. In a second example of a CAPTCHA with the prompt “Build a tower from the squares and then knock it down with the white circle,” if the user completes the prompt, the user solution is determined to be correct regardless of where the tower is constructed within the graphical interface, the order in which the squares are arranged to construct the tower, the color of the squares, or which square is hit first with the circle when the user topples the tower. However, in this example, if the user employs a yellow circle to topple the tower, or the user adds a triangle to the tower, the user solution is preferably deemed outside the bounds of a correct solution and therefore improper. However, the user solution may be analyzed in any other way.

Block S150 of the preferred embodiment, including comparing the user interaction pattern against an interaction model generated from interaction patterns of previous users, functions to isolate characteristics of the user interaction that are indicative of a human user and/or an automated user. The user interaction is preferably any of the aforementioned user interactions, such as a cursor or touch motion, and the user interaction pattern is preferably a portion of the user interaction. The user interaction pattern may be a snippet of the user interaction, such as a particular section of a cursor path provided within the graphical interface (e.g., a portion of the cursor path shown in FIG. 1) or the geometry of the input path (e.g., the angle of a direction change or the linearity of a portion of the input), as shown in FIGS. 10A-10C; alternatively, the user interaction pattern may be a characteristic of a portion or the entirety of the input path, such as average noise in the input path, the length of the input path, the average speed of the input, or where along the input path a mouse click is generated. However, the user interaction pattern may be of any other characteristic of the user interaction.

In a first variation, the user interaction is a path-type input (e.g., a cursor or touch motion) and the user interaction pattern is noise in a portion of the input path; the noise may be oscillations or deviations from a smooth input path, and Block S150 may include comparing the input path noise to input noise typical of a human or comparing the signal-to-noise ratio of the input path to a signal-to-noise ratio typical of a human, as shown in FIGS. 9A-9E. In a second variation, the user interaction is a path-type input provided through the graphical interface and the user interaction pattern is a direction change in a portion of the input path; Block S150 may include comparing the direction change of the input path to a direction change typical of a human interaction within the graphical interface. In a third variation, the user interaction is a path-type input and the user interaction pattern is an input velocity of a portion of the input path; Block S150 includes comparing the input velocity to an input velocity typical of a human interaction within the graphical interface. In a fourth variation, the user interaction pattern is a characteristic of a response to a moving object within the graphical interface; Block S150 includes comparing the user response with a characteristic of a response typical of a human interaction within the graphical interface. In this fourth variation, the characteristic of the response may be any of: a lag in direction change of an input relative to a direction change of the moving object (e.g., moving a Pac-Man-type figure within the graphical interface following a change of direction of a moving ghost therein); an input path leading up to selection of the moving object (e.g., the user attempting to catch a moving object within the graphical interface); an input path following release of the moving object (e.g., an input path including dragging an object into a bin); input timing following a change in distance between the object and a second object depicted within the graphical interface (e.g., a change of input following collision of two objects within the graphical interface); or any other relevant characteristic of the user interaction. In a fifth example in which the user interaction is a voice command, the user interaction pattern is voice inflection; the inflection provided by the user is compared against typical human voice inflections. In a sixth example, the user interaction is a facial expression and the user interaction pattern is the transition from one expression to another; the transition is compared against typical transitions by known humans, such as the stretching and wrinkling of skin around the eyes and cheeks (and the timing thereof) as the user begins to smile. However any other user interaction pattern of any other user interaction may be compared against any interaction model (e.g., a typical characteristic or behavior of a known human or of known automated software).

The interaction model preferably comprises characteristics and/or behaviors of users of known types (e.g., humans and/or automated scripts). The interaction model preferably includes data generated by at least one user that was/is a known human, such as input noise, input direction change, input speed or velocity, a response to a moving object, a voice inflection, a facial expression, or any other relevant characteristic of a human, and the interaction preferably include data generated by a plurality of known humans, such as ten, 100, 1000, or 10,000 known humans. However, the interaction model may also or alternatively include data generated by at least one user that was/is a known “bot” (automated software). The data is preferably stored in a database accessible by the server (or other entity completing Block S160), and the interaction model preferably comprises at least one isolated characteristic that is typical of a human user. However, the interaction model may define any number of typical human characteristics, and all or a (pseudorandomly selected) portion of the defined characteristics in the interaction model may be compared against the user interaction pattern in Block S150. The interaction model is preferably generated from user interactions of previous users to whom similar CAPTCHAs have been presented, but may alternatively be from user interactions of users accessing websites or applications not presenting CAPTCHAs to the users. In one example, a high-traffic website, such as Google.com, captures cursor movements on the Google homepage; these cursor motions are then be used, at least in part, to define the interaction model, even though CAPTCHAs are not typically presented on the Google homepage. Alternatively, the interaction model may be synthetic. For example, the interaction model may consist solely of computer code that defines a user interaction characteristic expected of human or automated users.

The interaction model may be static, wherein, once the typical human characteristic(s) is defined therein, the interaction model does not change. However, the interaction model may alternatively be dynamic, wherein subsequent user interactions from subsequent CAPTCHAs presented to a variety of users may be added to the interaction model. This may have the benefit of providing a more complete interaction model that accounts for human users of a wider variety of demographics. For example, teenage users may provide significantly faster input speeds and provide a solution to CAPTCHAs significantly faster than sexagenarians. A demographic of the user (such as determined in Block S130) may thus isolate a portion of the interaction model such that the user interaction is compared against user interactions of previous users in a demographic similar to that of the user, and this may have the benefit of improving the accuracy of the comparison of Block S150, the calculated human likeness score of Block S160, and/or the verification that the user is human (Block S170); this in depicted in FIGS. 8A and 8B. However, the user interaction and/or user interaction pattern is preferably added to the dynamic interaction model only if the service managing the interaction model (e.g., the server) is substantially confident that the user is human. For example, the user interaction pattern may only be added to the interaction model if the human likeness score is (substantially) greater than a threshold likeness score, wherein a human likeness score greater than the threshold likeness score is indicative of substantial confidence that the user is human.

The interaction model is preferably generated, maintained, and/or updated by the server. However, any other entity may administer the interaction model, such as the publisher, and the interaction model may be generated, manipulated, maintained, and updated in any other way.

Block S160 of the preferred embodiment, including calculating the human likeness score based upon the determination of Block S140 and the comparison of Block S150, functions to generate a value associated with confidence that the user is human (or automated software). The human likeness score is preferably a quantitative value included in a continuum of human likeness scores. In a first example, the continuum of human likeness scores includes 0 and all integers between 1 and 10, wherein a human likeness score of 9 reveals a relatively low confidence that the user is human and a human likeness score of 2 reveals a relatively high confidence that the user is human. In a second example, the human likeness score is a percentage, from 0% to 100%, wherein a human likeness score of 15.62% reveals a relatively low confidence that the user is human and a human likeness score of 91.17% reveals a relatively high confidence that the user is human. However, the continuum of human likeness scores may contain any other range and be of any other quantitative type. Furthermore, the continuum of human likeness scores may be qualitative. For example, the human likeness score may be selected from: “Definitely Not Human,” “Highly Unlikely To Be Human,” “Probably Not Human,” “May Not Be Human,” “Probably A Cyborg,” “May Be Human,” “Probably Human,” “Highly Likely To Be Human,” “Definitely A Human,” and any other relevant qualitative descriptor.

As shown in FIGS. 8A and 8B, Block S160 may utilize a decision tree to calculate the human likeness score. Various disparate elements, such as any of the user solution, user interaction patterns including noise and input geometries, and user data including an IP address, may be accounted for within the decision tree to ultimately select an appropriate human likeness score. The decision tree may further aid in isolation of the user into a particular user group, such as automated software, human spammer, and human, as shown in FIGS. 8A and 8B. Subgroups of these groups may also be implemented, such as demographic subgroups for humans (e.g., age, race, gender, education level) or location subgroups for human spammers (e.g., United States, India, China). The interaction model preferably includes substantial data for each group and/or subgroup such that a user, once isolated into a group, may be compared against similar users in Blocks S140, S150, and/or S155. Human likeness scores may be adversely affected for users with characteristics, solutions, and/or data outside what is typical or outside a predefined bound or cutoff for a particular group or subgroup into which the users have been placed; this may yield the benefit of improving the accuracy of the human likeness scores and the determination of the category of user (e.g., human, spammer, automated script). These groups and/or subgroups may also be dynamic, wherein groups and/or subgroups are added or deleted as additional data is made available through additional completions of CAPTCHAs by users.

Alternatively, Block S160 may utilize a weighted average to calculate the human likeness score for the user. Each element of the user completion of the CAPTCHA, including the user solution, the user interaction(s), and/or the user data may be separately compared against the correct CAPTCHA solution, the interaction model(s), and/or typical user data; the separate comparisons may then be weighted (e.g., 50% for the user solution, 30% for the user interaction, and 20% for the user data; or all weighted equally) and combined into a single human likeness score. In one variation: Block S140 further includes generating a first confidence group based upon the user solution; Block S150 further includes generating a second confidence group based upon the user interaction pattern; and Block S155 further includes generating a third confidence group based upon the user data. In this variation, Block S160 further includes determining the reliability of the first, second, and/or third confidence groups. In one example of determining the reliability of a confidence group, though the user provides an incorrect solution to the CAPTCHA, the user is determined to be a 75-year-old male and the confidence group based upon the user solution is determined to be substantially less reliable in suggesting that the user is human than either of the user interaction or the user data. In a second example of determining the reliability of a confidence group, user data suggests that the user has attempted 107 CAPTCHAs in the previous eight hours, and this data is determined to be substantially more reliable in suggesting that the user is automated software (or a human spammer) than the user solution or the user interaction. Block S160 may thus include compiling the first, second, and/or third confidence groups, based upon the determined reliability thereof, to generate the human likeness score.

Furthermore, Block S160 may utilize artificial neural networks, support vector machines, inductive logic programming, or other methods enabling machine learning. However, the human likeness score may be generated in any other way and with any other data or combination of data. Furthermore, an automated software likeness score may be calculated in Block S160 in addition to or in place of the human likeness score; the automated software likeness score may be calculated in any suitable way, such as by the decision tree or weighed average methods described above.

The method S100 may further comprise Block S170, including comparing the human likeness score to a threshold likeness score. This comparison preferably indicates that the user is either a human or an automated script, but may also indicate that the user is a human spammer or that the user belongs to any other group to which access should be restricted or permitted. The threshold likeness score may be fixed, such as at 65%, wherein a human likeness score greater than or equal to 65% indicates that the user is human and a human likeness score less than 65% indicates that the user is either inhuman, a human spammer, or within another group with restricted or limited access. However, the threshold likeness score may be variable. In a first example, the threshold likeness score is modified on a daily basis in order to meet a quota of users determined to be human (and thus granted access). In a second example, the publisher of the CATCHA adjusts the threshold likeness score to meet the needs of the publisher or host website or application. In a variation of this second example in which the publisher is a government agency, the publisher may set the threshold likeness score, for a government website, particularly high at 90% in order to substantially prevent spammers and automated scripts from accessing the site; in a variation of this second example in which the publisher is an online forum with a limited number of users, the publisher may set the threshold likeness score particularly low at 45% in order maintain a higher level of access to the site for potential new users. Such adjustments are preferably made by the publisher or host website or application through the aforementioned dashboard; the dashboard is preferably accessible through a web browser or mobile application. The publisher, etc., may also user the dashboard to submit an asset, marketing materials, or advertising data, or to generate generic CAPTCHA formats or customize existing CAPTCHA formats. However, the threshold likeness score may be adjusted, modified, or accessed in any other way.

The result of the comparison of the human likeness score to the threshold likeness score is preferably presented to the publisher or host website or application such that the publisher or host may immediately allow or restrict access for the user. In one variation, the server transmits the verification that the user is one of a human, automated script, or human spammer (of Block S170) to the publisher or host. In an alternative variation, the server transmits solely the human likeness score to the publisher or host; in this variation, the recipient of the human likeness score may analyze or otherwise manipulate the score, such as by comparing the human likeness score to a threshold likeness score managed directly by the recipient.

The method S100 may further comprise Block S180, including adding the user solution to a catalog of user preferences. Block S180 is preferably completed for a CAPTCHA that defines a survey, wherein the user solution to the CAPTCHA is indicative of a user preference, and the user preference is preferably only added to the catalog if the human likeness score of the user is above a given value and/or the user is determined to be human. In the example above in which the CAPTCHA requests a user preference for a shade of red of a Chevrolet Camaro, the user solution (that is not the rusty Camaro) may be added to the catalog and the catalog subsequently used by General Motors in the selection of the standard shade of red for a future Chevrolet Camaro line. However, the CAPTCHA that is a survey may be of any other form and test any other user preference.

The catalog of user preferences is preferably provided to the publisher and/or the host website or application, but may be made available to any other relevant third-party entity. In the example above: the server may simply serve to complete Blocks S100 through S160 of the method S100; the host may be a website paid by the publisher to display the CAPTCHA surveys; the publisher may be a marketing agency tasked with assembling survey CAPTCHAs for General Motors; General Motors may be a third party that pays for the results of the survey, wherein General Motors receives the results of the survey through the publisher. However, any parties associated with the method S100 may fulfill any other role and share any other information or survey result with any other party.

In the variation in which the CAPTCHA is a survey, the generic form of the CAPTCHA is preferably generated by the publisher (or a representative thereof). The publisher preferably accesses a dashboard provided by the server and generates the generic survey CAPTCHA therein, such as by providing assets and materials available to the publisher. Alternatively, the server (or a representative thereof) may receive assets from the publisher and generate the generic survey CAPTCHA at the request of the publisher. However, any other entity may generate and/or adjust the survey-type CAPTCHA. Furthermore, an asset provided by the publisher or other entity may simply be incorporated into the CAPTCHA as an advertisement, wherein the advertisement is distinct from any survey aspect of the CAPTCHA. The CAPTCHA selected for the user may be based upon the advertisement depicted therein, wherein the advertisement is tailored to user, such as by noting a cookie of the user, a past website visited by the user, an interest of the user siphoned from a social network or other account, or a demographic of the user; for example, the CAPTCHA of FIG. 3H may be matched to the user of FIG. 1.

The method S100 may further comprise Block S190, including generating the CAPTCHA. The CAPTCHA is preferably generated by the server upon request for a CAPTCHA from the publisher and/or the host of the website or application. However, the publisher or host may also generate the CAPTCHA. The CAPTCHA is preferably selected from a set of available generic CAPTCHA formats, such as those shown in FIGS. 3A-3H. The set of available CAPTCHA formats may be specific to a particular publisher or host, and the selection thereof may be suggested or requested directly by the publisher or host. Once the format of the CAPTCHA is selected, details thereof are preferably subsequently assigned. Specifically, as described above, a characteristic of the object depicted within the graphical interface of the CAPTCHA is preferably pseudorandomly assigned, such as any of an initial location, an initial orientation, an initial speed, and an initial direction of motion to the object. Once the CAPTCHA is selected and/or the relevant details thereof determined, the entirety of the CAPTCHA may be transmitted to the publisher and/or host for subsequent presentation to the user. However, generic CAPTCHA formats may be stored by the publisher and/or host such that only the details of the variables of the CAPTCHA must be transmitted thereto; this may yield the benefit of decreasing the time between when the user attempts to access a site or service and when the CAPTCHA is presented to the user. However, the CAPTCHA and the details thereof may be generated, selected, assigned, and/or transmitted in any other way.

As a person skilled in the art will recognize from the previous detailed description and from the figures and claims, modifications and changes may be made to the preferred embodiments of the invention without departing from the scope of this as invention defined in the following claims. 

We claim:
 1. A method for generating a human likeness score based on a Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) provided through a graphical interface, the method comprising: generating the CAPTCHA comprising the graphical interface and a first object and a second object depicted within the graphical interface; pseudorandomly assigning a visual characteristic of the first object within the graphical interface to differentiate the CAPTCHA from a previously-generated CAPTCHA, the first object distinct from the second object by the visual characteristic; assigning an instruction for solving the CAPTCHA based on the visual characteristic of the first object; receiving a user solution to the CAPTCHA; receiving a user interaction pattern descriptive of an interaction undertaken by a user, through the graphical interface, to enter the user solution; determining an accuracy of the user solution in satisfying the instruction for solving the CAPTCHA; comparing the user interaction pattern to an interaction model generated from interaction patterns of previous users; and calculating the human likeness score based upon the accuracy of the user solution and the comparison of the user interaction pattern to the interaction model, the human likeness score lying within a continuum of human likeness scores.
 2. The method of claim 1, further comprising comparing the human likeness score to a threshold likeness score to verify that the user is human.
 3. The method of claim 2, further comprising adding the user interaction pattern to a database of user interaction patterns comprising interaction patterns of previous users.
 4. The method of claim 2, wherein comparing the human likeness score to the threshold likeness score comprises determining the user to be human if the human likeness score is greater than the threshold likeness score.
 5. The method of claim 2, wherein comparing the human likeness score to the threshold likeness score comprises determining the user to be automated software if the human likeness score is less than the threshold likeness score.
 6. The method of claim 1, further comprising calculating an automated software likeness score based upon the accuracy of the user solution and the comparison of the user interaction pattern to the interaction model, the automated software likeness score lying within a continuum of automated software likeness scores.
 7. The method of claim 1, wherein receiving the user interaction pattern comprises receiving an interaction selected from the group consisting of: a cursor movement; a mouse click; a keystroke; a voice command; a joystick movement; a touch; a facial expression; and a gesture.
 8. The method of claim 1, further comprising receiving a set of user data distinct from the CAPTCHA, wherein calculating the human likeness score includes calculating the human likeness score further based upon the set of user data.
 9. The method of claim 8, wherein the set of user data includes at least one of: a CAPTCHA previously attempted by the user; an Internet Protocol address of the user; and a cookie associated with the user.
 10. The method of claim 1, wherein calculating the human likeness score comprises implementing a decision tree to calculate the human likeness score.
 11. The method of claim 1, wherein determining the accuracy of the user solution comprises generating a first confidence group based upon the user solution; comparing the user interaction pattern to the interaction model comprises generating a second confidence group based upon the user interaction pattern; and calculating the human likeness score comprises determining the reliability of the first and the second confidence groups and compiling the first and the second confidence groups, based upon the determined reliability thereof, to generate the human likeness score.
 12. The method of claim 11, further comprising: accessing user data, including at least one of a CAPTCHA previously attempted by the user, an Internet Protocol address of the user, and a cookie associated with the user; and generating a third confidence group based upon the user data; wherein calculating the human likeness score further comprises determining the reliability of the third confidence group and compiling the first, the second, and the third confidence groups, based upon the determined reliability thereof, to generate the human likeness score.
 13. The method of claim 1, wherein calculating the human likeness score comprises selecting a number value, from the continuum of human likeness scores comprising a continuum of number values, that correlates with a calculated confidence that the user is human.
 14. The method of claim 1, further comprising generating the interaction model by aggregating interaction patterns of previous users, wherein the interaction model is indicative of a characteristic of an interaction undertaken by a human through the graphical interface.
 15. The method of claim 1, wherein generating the interaction model comprises generating the interaction model from interaction patterns of a set of previous users comprising at least one known human.
 16. The method of claim 1, further comprising isolating the user interaction pattern from the user interaction, wherein the user interaction comprises a path-type input provided through the graphical interface, the user interaction pattern comprises a direction change in a portion of the input path, and comparing the user interaction pattern to an interaction model comprises comparing the direction change of the user interaction pattern to the interaction model that defines a direction change typical of a human interaction.
 17. The method of claim 1, further comprising isolating the user interaction pattern from the user interaction, wherein the user interaction comprises a path-type input provided through the graphical interface, the user interaction pattern comprises an input velocity of a portion of the input path, and comparing the user interaction pattern to an interaction model comprises comparing the input velocity of the user interaction pattern to the interaction model that defines an input velocity typical of a human interaction.
 18. The method of claim 1, wherein pseudorandomly assigning the visual characteristic of the first object comprises pseudorandomly assigning at least one of an initial location, an initial orientation, an initial speed, and an initial direction of motion to the first object within the graphical interface.
 19. The method of claim 1, wherein generating the CAPTCHA comprises generating the CAPTCHA in response to receiving a request, from a publisher, for the CAPTCHA.
 20. The method of claim 19, wherein generating the CAPTCHA comprises receiving an asset from the publisher and incorporating the asset into the CAPTCHA as an advertisement.
 21. The method of claim 1, wherein assigning the instruction for completing the CAPTCHA comprises assigning, to the CAPTCHA, an instruction related to at least one of the shape, the color, the size, the type, and the context of the first object within the graphical interface.
 22. The method of claim 1, wherein receiving the user solution comprises receiving the user solution comprising manipulation of the position of the first object within the graphical interface.
 23. The method of claim 22, wherein receiving the user solution comprises tracking manipulation of the first object within the graphical interface by the user.
 24. The method of claim 23, wherein tracking manipulation of the first object within the graphical interface comprises recording a timing characteristic and a path characteristic of manipulation of the first object within the graphical interface by the user.
 25. The method of claim 1, wherein generating the CAPTCHA comprises configuring the CAPTCHA for presentation within an interface selected from the group consisting of: a website; a mobile application; a web-based forum; and a web-based email client, and further comprising transmitting a portion of the CAPTCHA to a publisher for publication within the interface.
 26. The method of claim 1, further comprising correlating the user solution with a user preference and adding the user solution to a catalog of user preferences corresponding to a survey associated with the CAPTCHA.
 27. The method of claim 26, wherein adding the user solution to the catalog of user preferences comprises adding the user solution to the catalog in response to the human likeness score exceeding a threshold likeness score.
 28. The method of claim 1, wherein receiving a user interaction pattern comprises receiving the user interaction pattern comprising a keystroke, and wherein comparing the user interaction pattern to the interaction model comprises comparing a state of a key and a timing of the keystroke to the interaction model.
 29. A method for generating a human likeness score based on a Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) provided through a graphical interface, the method comprising: generating the CAPTCHA comprising the graphical interface and a first object and a second object depicted within the graphical interface; assigning a visual characteristic of the first object within the graphical interface to differentiate the CAPTCHA from a previously-generated CAPTCHA, the first object distinct from the second object by the visual characteristic; assigning an instruction for solving the CAPTCHA based on the visual characteristic of the first object; receiving a user solution to the CAPTCHA, the user solution comprising a path-type input entered by a user to move at least one of the first object and the second object within the graphical interface to solve the CAPTCHA; determining an accuracy of the user solution in satisfying the instruction for solving the CAPTCHA; isolating a noise component from the path-type input of the user solution; comparing the noise component to an interaction model, the interaction model defining input noise characteristics for human interactions and generated from path-type inputs entered by previous users to solve previous CAPTCHAs; and calculating the human likeness score based upon the accuracy of the user solution and the comparison of the noise component to the interaction model, the human likeness score lying within a continuum of human likeness scores.
 30. The method of claim 29, wherein isolating the noise component from the path-type input comprises calculating a signal-to-noise ratio of the path-type input, wherein calculating the human likeness score comprises calculating the human likeness score based on a deviation of the signal-to-noise ratio of the path-type input from a threshold signal-to-noise ratio defined by the interaction model.
 31. The method of claim 30, wherein isolating the characteristic response to the object comprises extracting an input timing following a change in distance between the object and a second object moving within the graphical interface.
 32. The method of claim 30, further comprising verifying that the user is human in response to the noise component exceeding the threshold signal-to-noise ratio and identifying the user as automated software in response to the noise component falling below the threshold signal-to-noise ratio.
 33. A method for generating a human likeness score based on a Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) provided through a graphical interface, the method comprising: generating the CAPTCHA comprising the graphical interface and an object depicted within the graphical interface; assigning a visual motion characteristic of the object within the graphical interface to differentiate the CAPTCHA from a previously-generated CAPTCHA; assigning an instruction for solving the CAPTCHA; receiving a user solution to the CAPTCHA, the user solution comprising a path-type input entered into the graphical interface by a user to solve the CAPTCHA; determining an accuracy of the user solution in satisfying the instruction for solving the CAPTCHA; isolating, from the path-type input, a characteristic response to the object moving within the graphical interface; comparing the characteristic response to an interaction model, the interaction model defining human characteristic responses to objects moving within graphic interfaces and generated from path-type inputs entered by previous users to solve previous CAPTCHAs; calculating the human likeness score based upon the accuracy of the user solution and the comparison of the characteristic response to the interaction model, the human likeness score lying within a continuum of human likeness scores.
 34. The method of claim 33, further comprising verifying that the user is human in response to the human likeness score exceeding a threshold human likeness score and identifying the user as automated software in response to the human likeness score falling below the threshold human likeness score.
 35. The method of claim 33, wherein isolating the characteristic response to the object comprises isolating a lag in direction change of the path-type input relative to a direction change of the object moving within the graphical interface, wherein calculating the human likeness score comprises calculating the human likeness score based on a comparison of the lag in direction change of the path-type input to the interaction model defining lags in direction changes of path-type inputs by humans.
 36. The method of claim 33, wherein isolating the characteristic response to the object comprises identifying an input path of a cursor leading up to selection of the object moving within the graphical interface, wherein calculating the human likeness score comprises calculating the human likeness score based on a comparison of the input path of the cursor to the interaction model defining input paths of cursors leading up to selections of objects within graphical interfaces by humans.
 37. The method of claim 33, wherein isolating the characteristic response to the object comprises identifying an input path of a cursor following release of the moving object within the graphical interface, wherein calculating the human likeness score comprises calculating the human likeness score based on a comparison of the input path of the cursor to the interaction model defining input paths of cursors following releases of objects within graphical interfaces by humans. 